One reason would be that these are pre-arranged wash trades. Brokers involved can only trade with specific orders at specific brokers, and apparently you ain't in the loop.
The increase in reported volume (even though not real, as your experience shows), along with the sudden appearance of false rumors regarding the stock coming off the greys, are simply part of the ongoing campaign of deception coming from Rox & crew.
The volume, and the rumors of "change"" at EMXC, are no more real than Rox's fish farm or any of the other BS stories they've put out over the years.
"It is difficult to get a man to understand something when his salary depends on his not understanding it."
Upton Sinclair